World number one Jannik Sinner will have his hearing into allegations of doping at the Court of Arbitration for Sport on April 16-17, the Lausanne-based body said on Friday. The World Anti-Doping Agency appealed after the International Tennis Integrity Agency (ITIA) cleared Sinner after he tested positive twice for the banned steroid clostebol in March last year. "No parties requested a public hearing and it will be conducted behind closed doors," CAS said in a statement. The ITIA accepted defending Australian Open champion Sinner's explanation that the drug entered his system when his physio used a spray containing it to treat a cut, then provided massage and sports therapy to the player.